KR20080098996A - Liquid crystal display - Google Patents

Abstract

A liquid crystal display device is provided to minimize the unhardened sealant which is enough exposed to the light since the sealing material does not pass the gate driving unit. A liquid crystal display of the high quality comprises followings. A first display panel(100) includes driving unit and pixel unit which are connected with fan out part. A second display panel(200) is facing the first display panel. A liquid crystal layer is formed on between the first and second display panel. A sealant(310) is contacted with the first and the second display panel and formed on the fan out part. The sealant comprises Photoresist material.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY}

1 is a schematic layout view of a liquid crystal display according to an exemplary embodiment of the present invention.

2 is an equivalent circuit diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention.

3 is a flowchart illustrating a procedure for manufacturing a liquid crystal cell for a liquid crystal display device according to the present invention.

4 is a schematic layout view of a liquid crystal display according to another exemplary embodiment of the present invention.

* Description of the major symbols in the drawings *

3: liquid crystal layer

100: thin film transistor array panel 110, 210: insulating substrate

191: pixel electrode 200: common electrode display panel

220: light blocking member 230: color filter

250: overcoat 270: common electrode

310: sealing material

400, 400R, 400L: gate driver

500: data driver

GL, GLL, GLR: gate line SL: sustain electrode line

DL: data line Q: thin film transistor

The present invention relates to a liquid crystal display device.

The liquid crystal display is one of the most widely used flat panel display devices. The liquid crystal display includes two display panels on which a field generating electrode such as a pixel electrode and a common electrode are formed, and a liquid crystal layer interposed therebetween. The liquid crystal display generates an electric field in the liquid crystal layer by applying a voltage to the field generating electrode, thereby determining an orientation of liquid crystal molecules of the liquid crystal layer and controlling the polarization of incident light to display an image.

Such liquid crystal displays are becoming larger and larger, but peripheral portions except for the display portion for displaying an image are getting narrower to increase productivity. Therefore, a structure for embedding some driving units such as gate driving units together with switching elements has been developed.

On the other hand, the liquid crystal of the liquid crystal layer is sealed by a sealing material so as not to leak, when the gate driver is formed with the switching element, the sealing material passes over the gate driver.

The sealant is made of a photocurable material, but light is blocked in the wiring of the gate driver so that the sealant cannot be completely cured.

The uncured encapsulant has a problem of contaminating the liquid crystal in contact with the liquid crystal layer and represented by the edge unevenness of the liquid crystal display device.

Therefore, the technical problem to be achieved by the present invention is to completely cure the sealing material to prevent the edge stain due to liquid crystal contamination.

According to an aspect of the present invention, a liquid crystal display according to the present invention is formed between a first display panel including a driving unit and a pixel unit connected to a fan-out unit, a second display panel facing the first display panel, a first display panel, and a second display panel. And a sealing material formed on the fan-out part by bonding the first liquid crystal layer and the second display panel.

The seal may comprise a photocurable material.

Each of the first display panel and the second display panel may be a quadrangle including a pair of vertical boundary lines and a horizontal boundary line, and the vertical boundary line of the second display panel may be positioned inside the vertical boundary line of the first display panel.

The distance from the vertical boundary of the second display panel to the vertical boundary of the first display panel may be 0.925 mm.

The pixel unit may include a thin film transistor and a pixel electrode connected to the thin film transistor, and the driving unit may include a circuit and a wiring formed together with the thin film transistor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

Next, a liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 4.

1 is a schematic layout view of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram of one pixel of the liquid crystal display according to the exemplary embodiment of the present invention.

1 and 2, a liquid crystal display according to an exemplary embodiment includes two display panels 100 and 200 facing each other and a liquid crystal layer 3 formed therebetween.

The lower panel 100 includes a gate driver 400, a data driver 500, a plurality of gate lines GL connected to the gate driver 400, and a plurality of data lines DL connected to the data driver 500. ) And the pixel PX connected to the gate line GL and the data line DL.

Each pixel PX is arranged in a substantially matrix form and includes a switching element Q connected to the gate line GL and the data line DL, a liquid crystal capacitor Clc connected thereto, and Storage capacitor (Cst). Holding capacitor Cst can be omitted as needed.

The switching element Q is a three-terminal element such as a thin film transistor, the control terminal of which is connected to the gate line GL, the input terminal of which is respectively connected to the data line DL, and the output terminal of the liquid crystal capacitor ( Clc) and holding capacitor Cst.

The liquid crystal capacitor Clc has two terminals, the pixel electrode 191 of the lower panel 100 and the common electrode 270 of the upper panel 200, and the liquid crystal layer 3 between the two electrodes 191 and 270 is a dielectric material. Function as. The pixel electrode 191 is connected to the switching element Q, and the common electrode 270 is formed on the front surface of the upper panel 200 and receives the common voltage Vcom.

Unlike in FIGS. 1 and 2, the common electrode 270 may be provided in the lower panel 100, and at least one of the two electrodes 191 and 270 may be formed in a linear or bar shape.

The storage capacitor Cst plays an auxiliary role of the liquid crystal capacitor Clc, and the storage electrode line SL and the pixel electrode 191 of the lower panel 100 overlap each other with an insulator interposed therebetween. A predetermined voltage such as the common voltage Vcom is applied to the storage electrode line SL. However, the storage capacitor Cst may be formed such that the pixel electrode 191 overlaps the front gate line directly above the insulator.

The gate driver 400 may be disposed at one edge of the lower panel 100, respectively, and may include a gate made of a combination of a gate-on voltage Von and a gate-off voltage Voff from the outside through the fan out part PL. The signal is applied to the gate line GL. The gate driver 400 includes a plurality of stages substantially arranged in a row as a shift register, and is formed and integrated in the same process as the switching element Q.

The data driver 500 selects a gray voltage from a gray voltage generator (not shown) and applies it to the data line DL as a data signal. The data driver 500 may be directly mounted on the lower panel 100 in the form of an integrated circuit chip or mounted on a flexible printed circuit film to form the lower panel in the form of a tape carrier package (TCP). 100 or may be mounted on a separate printed circuit board.

Meanwhile, the color filter 230 for displaying color is formed on the upper panel 200. The color filter 230 may display one of primary colors such as red, blue, and green. Alternatively, the color filter 230 may be formed above or below the pixel electrode 191 of the lower panel 100.

The common electrode 270 is formed on the color filter 270. An overcoat 250 may be formed between the common electrode 270 and the color filter 230 to planarize the substrate.

The liquid crystal layer 3 has negative dielectric anisotropy, and the long axis of the liquid crystal molecules 31 of the liquid crystal layer 3 may be perpendicular to the surfaces of the two display panels 100 and 200 in the absence of an electric field.

A sealing material 310 for sealing the liquid crystal layer 3 is formed between the two display panels 100 and 200. The encapsulant 310 is positioned on the fan out part PL between the gate driver 400 and the boundary line t of the upper panel.

A light blocking member (not shown) overlapping the sealing material 310 may be formed on the substrate 210.

An alignment layer (not shown) is formed on the inner surfaces of the display panels 100 and 200. Polarizers (not shown) are provided on the outer surfaces of the display panels 100 and 200, and polarization axes of the two polarizers are orthogonal to each other.

The liquid crystal display may further include a phase delay film (not shown) and a backlight unit (not shown) for supplying light.

Next, a method of manufacturing the liquid crystal display will be described with reference to FIGS. 3 and 1.

3 is a flowchart illustrating a procedure for manufacturing a liquid crystal cell for a liquid crystal display device according to the present invention.

First, as shown in FIG. 3, the upper and lower mother substrates are completed in respective processes (S100 and S102). Thereafter, a column spacer having a columnar shape formed by a spherical bead spacer or a photographic process is formed on one of the upper and lower mother substrates to maintain the gap between the upper and lower mother substrates. (S104).

In addition, a portion formed of a material for bonding the two mother substrates and defining a portion where the liquid crystal is filled, and forms a sealing material 310 to prevent the liquid crystal from leaking (S106). The sealant consists of a photocurable material and a thermosetting material and is mixed in a ratio of approximately 3: 1.

Next, the liquid crystal is dropped (S108) in the region defined by the sealing material 310 to form a liquid crystal layer.

Next, the upper and lower mother substrates are aligned and moved to a pressurizing device, and then the upper and lower display panels are bonded by curing light by irradiating with light (S200). In this case, the light is irradiated from the lower panel side, and the heat treatment is also performed to simultaneously cure the thermosetting sealant included in the sealant 310.

This is because the edge light blocking member is formed on the upper display panel corresponding to the gate driver 400 and the fan out part PL.

As shown in FIG. 1, when the sealing material 310 is formed on the fan out part PL, more light is transmitted than when the sealing material 310 is formed on the gate driver 400 having a tight wiring space. Since the sealing material 310 is transferred, the sealing material 310 is mostly cured.

In addition, since the sealing material 310 also includes a thermosetting material, the amount of the sealing material 310 which is uncured by light can be minimized as compared with the sealing material 310 which is formed of only a photocurable material.

Subsequently, the liquid crystal display device assembly is scribed along the cutting line to separate the liquid crystal cell into each liquid crystal cell (S300).

Referring to FIG. 1, since the sealing material 310 is positioned at the fan out part PL, the upper panel 100 is also cut to be aligned to the left by moving the sealing material 310 in the conventional position.

Then, the edge t1 of the upper panel 200 is closer to the edge t2 of the lower panel than before, and the distance L is approximately 0.925 mm.

Meanwhile, in the related art, the right boundary lines t3 and t4 of the upper panel 200 and the lower panel 100 coincide with each other, but according to the exemplary embodiment of the present invention, since the upper panel 200 is moved to the left side, the upper panel 200 The boundary between the right boundary line t3 and the lower panel 100 does not coincide with each other and is aligned about 0.925 mm apart. Therefore, the sealing material 310 adjacent to the right boundary line t3 of the upper panel 200 is further moved toward the pixel PX. At this time, the moved sealing material 310 is not in contact with the pixel PX.

Second Embodiment

4 is a schematic layout view of a liquid crystal display according to another exemplary embodiment of the present invention.

Since most of the structure is the same as in the first embodiment, the description of the same parts will be omitted and only the other parts will be described in detail.

The pixel electrode 191 of the second embodiment is approximately three times longer than two sides parallel to the gate lines GLR and GLL than two sides parallel to the data line DL. If the vertical side is shorter than the horizontal side, the number of pixel electrodes 191 positioned in each row is smaller than that of the vertical side is longer than the horizontal side, and the number of pixel electrodes 191 positioned in each column is larger. Therefore, since the total number of data lines DL is reduced, the number of integrated circuit chips for the data driver 500 may be reduced, thereby reducing material costs.

Although the number of gate lines GL is increased as much as the gate drivers 400L and 400R are integrated with the switching element Q, the increase in the number of gate lines 121 is not a problem.

Since the number of gate lines GL formed on one side is large, the gate drivers 400R and 400L can be formed on both sides of the pixel portion. That is, the odd-numbered gate lines GLR and the even-numbered gate lines GLL are divided and connected to the gate drivers 400R and 400L, respectively.

In the embodiment of the present invention, the sealing material does not pass through the gate driving part, thereby minimizing the sealing material which is not sufficiently cured by being exposed to light.

Therefore, since the liquid crystal is not contaminated by the uncured sealing material, it is possible to provide a high quality liquid crystal display device that does not generate edge stains.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (5)

A first display panel including a driving unit and a pixel unit connected to the fan-out unit, A second display panel facing the first display panel, A liquid crystal layer formed between the first display panel and the second display panel, and A sealing material formed on the fan-out part by bonding the first display panel and the second display panel to each other. Liquid crystal display comprising a. In claim 1, The sealing material includes a photocurable material. In claim 1, A quadrangle including a pair of vertical boundary lines and a horizontal boundary line of each of the first display panel and the second display panel, The vertical boundary line of the second display panel is positioned inside the vertical boundary line of the first display panel. In claim 3, And a distance from the vertical boundary of the second display panel to the vertical boundary of the first display panel is 0.925 mm. In claim 1, The pixel unit includes the thin film transistor and the pixel electrode connected to the thin film transistor, The driving unit includes a circuit and a wiring formed together with the thin film transistor.

Images